Modbus USB PORTNOTOPENERROR

dear All

I using node-red to convert a Modbus signal to MQTT .
It was working fine. However I have install on my raspberry Pi4 a SSH and VNC connection in order to have a distance access. I do not know if it is linking but now , node-red said me that :

"Error: {"name":"PortNotOpenError","message":"Port Not Open","errno":"ECONNREFUSED"}"

I am using the " /dev/ttyUSB0" designation .

I have seach hours on forum and internet but didn't find an easy answer about this permission needed.

could you help ?

regards

Beber

Hi Bert,

I am experiencing the same issue on a Raspberry Pi4 but it works fine under Windows10. Did you get any other feedback?

regards,
JohnB

This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.